Screen-plate for paper manufacture.



No. 643,52l. Patented Feb. I3; |900. W. H. MGCARRULL.

x SCREEN PLATE FOR PAPER MANUFAGTURE.

(Application led May 23, 1899A me Nonms versus co., womunm. w'umm'on n c NITED STATES PATENT Fries.

VILLIAM I-I. MCCARROLL, OF VATERTOWN, NEV YORK, ASSIGNOR OF ONE- HALF TO JOHN B. TAYLOR, OF SAME PLACE.

SCREEN-PLATE FOR PAPR IVIANUFACTUR.

SPECIFICATION forming part of Letters Patent No. 643,521, dated February 13, 1900.

Application filed May 23, 1899. Serial No. 717,958. (No model.)

To @ZZ whom i may concern: t

Beit known that I, WILLIAM H. MCCAR- ROLL, a citizen of the United States, residing at Watertown, inthe county of Jefferson and State of New York, have invented certain new and useful Improvements in Screen-Plates for Paper Manufacture; and I do declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements inscreen-plates used in papermaking machines, in which the screen-plates, made of thin metal, are adapted to be reversed and interchangeable, and being of thin material may be easily sawed and owing to the narrowness of the plates may be rigidly secured to girders of the screen-frame, thus preventing unnecessary vibration common in screens of ordinary use.

More specifically, the present invention resides in the provision of a paper-making machine in which the screen-plates are made narrow, of thin material, and secured along their longitudinal edges to girders by means of metallic strips and tightening-bolts, the nuts of which bolts are preferably held in mortised recesses in the girders, thus allowing the bolts to be tightened as the nuts are held stationary.

To these ends and to such others as the invention may pertain the same consists, further, in the novel construction, combination,

and adaptation of parts,'as will be hereinafter more fully described and then specifically dened in the appended claim.

My invention is clearly illustrated inthe accompanying drawings, which, with the letters of reference marked thereon, form a part of this application, and in which- Figure l is a perspective View of a screenbox, showing a portion broken away to better illustrate the detailed construction of the removable plates. Fig. 2 is a cross-sectional view through the screen box and plates.

Reference now being had to the details of 5o the drawings by letter, A designates the outer wall of the box or fra-me, in which are disposed in rows the girders B, which have their under or lower edges tapered, as seen at B', so as to offer as little resistance as possible to the passage of the stock underneath. Resting on said gi rders are the longitudinal edges of the screen-plates C, which are made thin, thus rendering them capable of being easily sawd. Resting on the edges of said plates 6o are the metallic bars D, with longitudinallytapering edges. The ends of these bars are also beveled and fest against the beveled face of the cleat R. The walls of the girders are lnortised out, as at E, for the reception of the nuts F, into whichthe threaded vends G of the bolts G. are screwed. These bolts are passed through apertures in said bars and through apertures in the girders leading to said mortised recesses, whereby the bars may 7o be clamped against the edges of the screenplates and securely hold the same to the girders.

From the foregoing it will be noted that when for any purpose the screens, or any of them, become damaged in anyr way they may be easily replaced or reversed, which is a great advantage over the screens commonly in use, which are usually made of a thick metal, which previous to being sawed are 8o furrowed out and being wide are apt to vibrate, thus diminishing the work which the screens should perform.

Having thus described my invention, what I claim to be new, and desire to secure by Letters Patent, is-

A screen-box for pulp-strainers, comprising in combination with the outer walls, a series of girders mounted in parallel rows in the ends thereof and provided with recesses, said g'o girders being disposed a slight distance above the bottom of the open box, a series of thin reversible strainer-plates,resting on the upper seated in said recesses in the gil-ders, all sub- 1o edges of the girders, metallic clamping-bars stantially as shown and described.

having beveled edges and ends, and bearing In. testimony whereof I aix my signature on the edges of said plates, a beveled cleat in presence of two Witnesses.

secured to the inner Wall of the box and beaii ing against the beveled ends of the elainping- WILLAM H' MCCARROLT" bars, and between the longitudinal edges of the screen-plates, and the tightening-nuts CLARENCE II. RosE, J oHN M. BRAGGER.

l s bars, bolts passing through the olampnglVitnesses: 

